Valdivia (1991) discusses the Ishihuinca quartz vein near the pueblo of Caraveli. This vein is
reported to have produced about 110,000 ounces of gold from mineralized vein material grading
12 to 15 g/t Au. The principle producing vein is 150 meters long and 1.2 to 10.0 meters wide.
Valdivia notes that gold grade improves below an altitude of 2100 meters ASL, and gives
arguments supporting an assumed resource of one million tonnes grading more than 10 g/t gold
(minimum 320,000 ounces).